Following their trip to the hot springs, Naoya decides to continue his two-timing relationship with Saki and Nagisa, and will treat them fairly. Add to the mix, Mirika who kissed him first, and Shino who has a secret crush on Naoya. The stage is set for the five lovebirds as summer vacation arrives. Fireworks, camping, and then to Okinawa... Mirika's younger sister, Risa, also makes an appearance. The neo-standard love comedy gets more and more exciting!